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Use __gnu_inline__ for __extern_always_inline in g++-4.2 

Use the __gnu_inline__ attribute in _FORTIFY_SOURCE's __extern_always_inline
macro whenever the compiler supports it. Previously this macro only included
the __gnu_inline__ attribute in C++ mode for gcc >= 4.3. However,
__gnu_inline__ semantics are always desired for the __extern_always_inline
functions, and are available in g++ 4.2 (and some releases of g++ 4.1, and
also in Clang, which claims to be g++ 4.2).

This change stops g++-4.2 from emitting weak definitions for the fortify
wrapper functions if they can't be inlined, and also improves Clang
compatibility.
This commit is contained in:
Richard Smith 2013-05-01 20:32:38 +10:00 committed by Allan McRae
parent 10de07f5fd
commit 0695940b8a
2 changed files with 14 additions and 8 deletions
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8
ChangeLog
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@ -1,3 +1,11 @@
2013-05-01 Richard Smith <richard@metafoo.co.uk>
* misc/sys/cdefs.h (__extern_inline, __extern_always_inline)
[__GNUC__ && (__GNUC_STDC_INLINE__ || __GNUC_GNU_INLINE__)]:
Use __attribute__ ((__gnu_inline__)).
[__GNUC__ && !(__GNUC_STDC_INLINE__ || __GNUC_GNU_INLINE__)]:
Don't use __attribute__ ((__gnu_inline__)).
2013-05-01 Joseph Myers <joseph@codesourcery.com>
[BZ #15423]

14
misc/sys/cdefs.h
View File

@ -318,10 +318,12 @@
# define __attribute_artificial__ /* Ignore */
#endif
/* GCC 4.3 and above with -std=c99 or -std=gnu99 implements ISO C99
inline semantics, unless -fgnu89-inline is used. */
#if (!defined __cplusplus || __GNUC_PREREQ (4,3)) && defined __GNUC__
# if defined __GNUC_STDC_INLINE__ || defined __cplusplus
#ifdef __GNUC__
/* One of these will be defined if the __gnu_inline__ attribute is
available. In C++, __GNUC_GNU_INLINE__ will be defined even though
__inline does not use the GNU inlining rules. If neither macro is
defined, this version of GCC only supports GNU inline semantics. */
# if defined __GNUC_STDC_INLINE__ || defined __GNUC_GNU_INLINE__
# define __extern_inline extern __inline __attribute__ ((__gnu_inline__))
# define __extern_always_inline \
extern __always_inline __attribute__ ((__gnu_inline__))
@ -329,10 +331,6 @@
# define __extern_inline extern __inline
# define __extern_always_inline extern __always_inline
# endif
#elif defined __GNUC__ /* C++ and GCC <4.3. */
# define __extern_inline extern __inline
# define __extern_always_inline \
extern __always_inline
#else /* Not GCC. */
# define __extern_inline /* Ignore */
# define __extern_always_inline /* Ignore */